Feed-valve device



C. C. FARMER.

FEED VALVE DEVICE.

APPLICATION HLED 026.30. I920.

1,43%898. Patented 00f. 3, 1922.

BRAKE VALVE DEVICE 2. I I 2 i V a a BRAKE IPE l4 6' 24 2O 6- TIMING RESERVOIR FEEIIVALVE nzvscs 3 lNVENTOR C LYDE C. FARMER ATTORNEY -1 m Til H W in it til ll CLYDE C. Flnltt-TVIER, OF EDGE-W603, PE lllTSYLVANEA, ASSIGNOR TO THE VIES'IING- HOUSE BRAKE COMPANY, Q1 TION OF PENNSYLVANIA.

JILIMIERDING, L ENNSYLVANIA, A CORPORA- rnnnvnrvn :onvron Application-filed December 30, 1920.

To all whom it may concern: 1

Be it known that l, CLYDE C. FARMER, a citizen of the United States, residing at l ldgeivood, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Feed-Valve Dcvices, of Which the following is a spe iiication.

This invention relates to fluid pressure bralres, and more particularly to means for controlling the supply of. fluid for recharging the brake pipe in releasing the brakes.

l l ith the standard automatic fluid pressure brake system, it the brake valve handle is turned to full release position, fluid at full main reservoir pressure is supplied to the brake pipe, and it he handle is allowed to remain in full release position for too long a period, the bral-ze pipe Will become overcharged.

The principal object oi my inventi n is to provide means for preventing; the overcharge of the brake pipe when the brake valve handle is placed in full release position.

In the accompanying drawing; Fig. 1 is a diagrammatic view, mainly in section, of,

a fluid pressure brake equipment embodying my invention; and l1 2 a sectional'vieiv of the brake valve in running position.

In Fig. 1 ol: the drawing is shown a brake valve device of the usualconstruction, comprising a casing 1 having a valve charo her 2, containing a rotary valve 3 adapted to be operated by a handle l'tor controlling the admission and exhaust of fluid under pressure to and from the hralre pipe According}: to inv invention, a valve device is provided tor controlling the supply ol': fluid to the brake pipe in releasing: the brakes, connirising a casino; "3, containing: diaphragm 'i'. having chamber at one s de connected to a pipe 9 through which the usual teed valve device ll) supplies fluid to the brake valve device, so that said diaphragm is cruistantly subject on one side to fluid at teed valve pressure. The chamber ll at the opposite side of the di phlegm 7 is connected by passage 12, containing check valve 13, to pipe 14, through Which fluid under pressure is supplied to the rotary valve chamber 2. i

- A valve 15 is adapted to be operated by Serial No. 433,982.

from a passage 16 to chamber 11.

For controlling the supply of fluid under pressure to pipe 14-, a valve piston 1? is provided, having one side open to passage 16 and. subject to the pressure of aspring 18 and adapted to control communication from the main reservoir lilthrough a pipe 20 and a passage 21 tothe pipe 14.

For controlling; the operation of the valve piston 17, a limiting valve device is pro vided, coinprisin a double seated piston 22, subject on one side to the pressure in a timing reservoir 23 as supplied through a pipe 24 and on the opposite side to the pressure of a spring 25. r

The piston operates a valve 26 for controlling communication from a passage 27, leading to the spring side of valve piston 17, to an atmospheric vent port28, the piston 22 being'movable relatively to the valve 26, and saidvalve being acted upon by a spring 29, so as to ensure the seating of the piston 22 as Well as the valve 26.. I

=ln running position, as Well as all other positions of the brake valve, except full release position, the pipe 2% is connected through a'cavity 30 in the rotary valve 3 with an exhaust port 31.. so that in these positions, the timing; reservoir 23 is innintained at atmospheric pressure and the upper side of the piston 22 being therefore subject to atmospheric pressure, the piston 22 will be maintained'in its upper position by spring 25, and the valve 26 will then be held open, thus venting fluid under pressure from the spring side of the valve piston l7.

Fluid from me main reservoir sup- .lied thr oup h pipe 20 to the upper tace of xalve piston l7 then operates to ma ntain th-i piston in its open o in which fluid is supplied [ruin the in rese voir to the pipe 1 and thence to the rotary valve chamber 2.

in the rotary valve 3 to the brake pipe 'llhe port connection ot pipe 20 is restricted at 3 so that it requires a predetermined time to charge the reservoir 23 to main reservoir pressure.

hen the pressure in the timing reservoir 23 has been increased to a predetermined degree the time required being; dependent upon the size of the port 2-H, and such that there will be no danger of overcha Ju tl o brake pipe to an undesired extent, the piston. 22 will be operated to close the valve 26 and cut oil? the QXl'lmlSt port from passage 27. 'The pressure on the spring side of the valve piston 17 then quickly builds up by flow through the restricted. port andv the fluid pressures quickly becoming); equalized on opposite sides of the valve piston, the spring 18 operates to movethe piston to its upper seat, cutting; o1? the turther flow of fluid from the main reservoir to the rotary valve chamber 2.

As soon as the valve piston 17 moves to its closed position, the pressure in valve chamber 2 and pipe 1% drops by flow to the brake pipe and consequently, the pressure in chamber' 11 at one side of diaphragm 7 is reduced by flow past check valve 13 to pipe 14:, so

that the feed valve pressure acting in chamber 8 operates the diaphragm 7 to open valve 15 and permit the flow of fluid from the main reservoirlS through passage 21, passage 16, past the valve 15 to passage 12 and past the check valve 13 to pipe 14; and thence to valve chamber 2 and the brake pipe 5. The How of air to the brake pipe continues until the brakopipe pressure has been increased to substantially teed valve pressure, when the valve 15 is allowed to seat, cutting off the further flow of fluid to the brake pipe. The chamber 8 may be provided with a restricted atmospheric port 36, so as to pre vent possible overcharging oi chamber 8 above the standard teed valve pressure through leakage from the feed valve device. It the hralre valve handle is turned from release position to lllllninq' position, the

ing reservoir ."ill be vented to the atmosphere through cavity 30 and erdiaust V as hereinhefore described, so that th" piston will again assume its upper position, in which the valve is opened and the valve piston 17 is operated to'open communication for supplying fluid from the main reservoir to the rotary valve chamher 2.

Having now described my invention, what I claim as new and desire to secure by Let- Patent, is

1. in a fluid pressure brake, the combination with a brake pipe, main reservoir, and a brake valve device having a position for supplying fluid from the main reservoir to the brake pipe, or" a valve device operated upon venting fluid from one side for supplying fluid to the brake pipe, a valve for venting fluid from said valve device, a reservoir, and means operated. upon a predeterm ned increase in pressure in said reservoir tor closinp; said valve.

2. In a fluid pressure brake, tie combination with a bralre pipe, main reservoir, and a brake valve device having); a full release position in. which fluid is supplied from the main reservoir to the hralce pipe, of valve means operated upon venting fluid from one side for supplying fluid from themain reservoir to the hralre pipe, a alve for venting fluid from said valve means, a reservoir adapted to he charged with fluid under pressure at predetermined rate in the full release position of the brake valve device, and means operated at a predetermined increase in pressure in said reservoir for closing said valve.

8. In a fluid pressure brake, the combination with a brake pipe, main reservoir, and brake valve device having a full release position in which fluid is supplied from the main reservoir to the brake pipe, of a valve piston normally subject on opposite sides to fluid unr pressure and operated upon ventng tluid from oneside for supplying fluid the main reservoir to the brake pipe, a reservoir adapted to he charged with fluid under pressure a predetermined rate in the .tull. release position of the brake valve device, and a valve device tor venting fluid from said valve piston and operated upon a predetermined increase in pressure in said reservoir for cutting oh the venting of fluid from said valve piston to thereby permit said valve piston to close and cut off the furthcr flow of fluid from the main reservoir to the brake pipe.

4: In a tluid pressure loralre, the combination with a brake pipe, main reservoir, and a bralrc valve device having a position for supplying fluid from the main reservoir to the brake pipe, of a reservoir adapted to he charged vv' h fluid under )ressure from the main reservoir at a prede ermined rate and means for controlling the supply of fluid tron] the main reservoir to the brake valve device and operated upon a predetermined increase in pressure in said reservoir for cutting oil? the flow of fluid from the main reservolr.

5. In a fluid pressure brake, the combination with a brake pipe, main reservoir, and a brake valve device having a position for supplying fluid from the main reservoir to the brake pipe, of means for controlling the supply of fluid from the main reservoir to fluid to the brake pipe at a maximum pres sure less than full main reservoir pressure.

6. In a fluid pressure brake, the combination with a brake pipe, main reservoir, and a brake valve device having a full release 10 position, of means operated upon movement of the brake valve device to full release position for first supplying fluid at full main.

reservoir pressure through the brake valve device to the brake pipe and for then Supplying fluid to the brake pipe at a maximum pressure a predetermined degree less than the full main reservoir pressure.

In testimony whereof I have hereunto set 111 hand.

y CLYDE O. FARMER. 

